Democrats don't need to all stand behind one standard bearer; especially for the midterms.

There's debate as to whether the Democrats should lean left or toward the center in politics. I think, especially for the midterm election, they could do both depending on the region. Congressional and local races can play to the constituents of various diverse places. There doesn't have to be one standard bearer for the entire party.

This gets a bit more tricky for presidential elections, but still, the party of the big tent ought to be able to function with civility, given much diversity of opinion within.